Consumption of Green Tea and its Health Effect on Sleeping among Hong Kong Young Adults

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Subjects This study was conducted with young adult interviewees aged 18-24. Subjects were selected by simple random sampling. The 100 questionnaires were distributed face-to face in several education institutes including The University of Hong Kong, HKU SPACE Po Leung Kuk Community College and The Hong Kong Polytechic University in March 2014. Most of the respondents are students in those institutes. Approval was obtained from the Human Research Ethics Committee for Non-Clinical Faculties, the University of Hong Kong and the written informed consent forms were given to volunteers at the beginning of the study. Materials The questionnaire consists of four sections including basic information, green tea drinking habit, knowledge about health effects of green tea and self- described health condition. The sample was composed of 100 individuals who finished the questionnaires including demographic and lifestyle factors. Moreover, the participants were also asked habitual green tea consumption such as the frequency of drinking green tea, the number of cups of green tea they drink, the drinking time slot and the drinking method. In addition, the interviewees answered questions regarding subjective sleeping quality and time of sleeping and waking up. A question on problems related to sleeping quality was included. Statistical Analysis The subjects were classified into groups by male and female, green tea drinkers and non-green tea drinkers, as well as by different drinking method including tea leaves, tea bag, bottle drink and tea powder. Respondents were separated into different groups according to their consumption amount, low (≤ 4 cups which is a median) versus high dose (> 4 cups) in the questionnaire. The consumption amount was cal... ... middle of paper ... ...p Medicine Reviews, 12(2), 153-162. Sereshti, H. & Samadi, S. (2014). A rapid and simple determination of caffeine in teas, coffees and eight beverages. Food Chemistry, 158, 8-13. Suen, L.K., Hon, K.L. & Tam, W.W. (2008). Association between sleep behavior and sleep-related factors among university students in Hong Kong. Chronobiology International, 25, 760-775. Suzuki, Y., Miyoshi, N., & Isemura, M. (2012). Health-promoting effects of green tea. Proceedings of the Japan Academy, 88(3), 88-101. Tseng, H.C., Wang, C., Cheng, S.H., Sun, Z. Chen, P. S., Lee, C., … Yang, Y. (2014). Tea-drinking habit among new university students: Associated factors. Kaohsiung Journal of Medical Sciences, 30, 98-103. Tsui, Y., & Wing, Y. (2009). A study on the sleep patterns and problems of university business students in Hong Kong. Journal of American College Health, 58(2), 167-176.

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